Process of applying covers to drawing rolls



4, 1953 E. J. COURTNEY 2,647,556

PROCESS OF APPLYING COVERS T0 DRAWING ROLLS Filed May 20, 1948 Inmentor Patented Aug. 4, 1953 PROCESS OF APPLYING COVERS T DRAWING ROLLS Edward J. Courtney, Oaklyn, N. J.

Application May 20, 1948, Serial No. 28,247

3 Claims.

This invention relates to a process for applying covers to rolls, such, for example, as drawing rolls in thedrafting of yarn, and it is particularly useful in applying covers of a compressible material such .as cork or compositions containing cork.

The nature, objects and advantages of the invention will be best understood from the follow- I-i'eretofore it has been the general custom (a) to form a relatively long tube of the covering material and cut it into rings which are subsequently applied to the roll, or (b) to take a strip of the covering material of appropriate width and apply the strip to the roll by the aid of a machine having arms which engage the ends of the strip and wrap it around the roll, bringing the ends in abutting relationship. In both cases a cement is applied to the covering material to hold it on the roll.

The first procedure is relatively unsatisfactory because of the difficulty, among other things, of securing a firm adherence. There are many rejects and recovering is frequently required before the useful life of the cover is ended. In the second procedure the arms of the machine are provided with pointed projections to engage the strip and, because of the pressure necessarily applied, relatively deep indentations are left in the cover which necessitates relatively extensive machining to remove these imperfections. Furthermore, the strip must be first steamed and the strip must be held in place by the machine for substantially a day, besides which it is frequently necessary to cut away a portion of the strip to secure proper fit.

The primary object of the invention is to overcome the foregoing difficulties and to provide a simple and effective process and apparatus whereby the cover is most effectively secured, with scarcely any rejects and with a great reduction in the time during which the strip must be held in place before removal from the apparatus.

It is a further object of the invention to compress the material of the cover in the application thereof so as to ensure an effective bond between the cover and the roll. How the foregoing, together with such other objects and advantages as may hereinafter appear, are realized is illustrated in the accompanying drawings, wherein- Fig. 1 is a plan view of a strip of cork or of a composition containing cork which is to constitute the cover.

Fig. 2 is a vertical section through the cover and ring die members employed in attaching the cover and illustrates the first step in the process of application.

Fig. 3 is a view similar to Fig. 2 but illustrating the completion of the attachment, and

Figs. 4 and 5 are respectively plan views of the upper and lower die members of Figs. 2 and 3.

Referring now to the drawings, and particularly to Figs. 2 to 5, the reference numeral "I indicates a base plate or support provided with a center pin or other positioning device 8 after centering the roll 9, which is to be covered. The lower die member I0 is in the form of a ring and rests upon the support 'I and concentrically surrounds the roll 9, leaving an annular space H therebetween which is rectangular in cross section, the inner face of the ring being parallel to the outer face of the roll. For ease in centering the ring ID the support I may be provided with a plurality of suitably spaced pins I2 or the like.

The upper ring-like die member I3 when in place, rests upon the lower die member II]. This ring is of greater height than the lower ring I0. Its outside diameter is desirably the same as that of the lower die member for convenience in centering by hand. The inner periphery of the ring I3, however, instead of being normal to the upper and lower faces of the ring, as is the case with the inner periphery of the ring I0, is in this instance given a draft, 1. e., it slightly tapers upwardly and outwardly from the bottom face. At the lower face the inner periphery is the same diameter as the internal diameter of the ring Ill.

The first step of the process is to bend the strip I4 of Fig. 1 by hand into the form of a ring for insertion into the upper portion of the ring I3. This can be readily done by reason of the fact that the ring I3, being of greater depth than the ring Il and having its inner periphery tapered, the upper portion of the central opening in ring I3 is larger than the opening of ring I0. At this point attention is drawn to the fact that the strip I4 is desirably longer than the internal periphery or circumference of the ring I0. For the size of roll shown (4 in diameter) the strip is A, longer than the internal periphery or circumference of member ID.

The next step after insertion of the strip I4 in the form of a ring in the upper part of die member I3 is to bring the head I5 of any suitable form of press (not shown) into the position shown in Fig. 2. It will be noted that the diameter of the head I5 is substantially the same as or slightly less than the internal diameter of the die I3 at its bottom.

This next step is to bring the head downwardly,

forcing the strip 14, now in the form of a ring, downwardly through member 13 and into member NJ, as shown in Fig. 3. During this operation the ring formed by the strip is brought under inward and annular compression due to the taper of the inner wall of the member 13 so that the ends Ida and Nb are firmly pressed against one another with substantial pressure. There will also be axial compression of the ring formed by the strip tending to flatten the wall of the ring. Because of these pressures and the efiect thereof, it will be seen that when the strip is in the position shown in Fig. 5, it will not only be strongly pressed against the outer surface of the roll 9 but the ends Ma and Nb Will also be in firm pressure engagement.

It will be understood that before insertionof the strip, the surfaces at the ends [4a and Mb and the face which will constitute the inner periphery of the strip when it is formed into a ring, have had a suitable plastic or other form of quick drying cement applied thereto.

The net result will be a firm adherence of the cover to the roll.

After the parts are in the position of Fig. 3, the head I5 is withdrawn, the'ring i3 is lifted off, as is the ring H], which last mentioned ring will carry with it the roll and the intervening cover. It is only necessary to allow the roll and its cover to remain in the lower ring'for a period long enough to permit the cement to set sufficiently, this usually taking only about two hours.

In some instances slight ;sand-papering of the joint in the cover may lie-required.

I have described the cement as being applied to the end surfaces of the strip and that surface of the strip which will constitute the inner periphery of the strip when applied to the roll. "It will of course be understood that the cement may be applied to the outer periphery of the roll instead of to said last mentioned surface, or that cement may be applied both to strip and toroll.

I claim:

1. The process of covering a roll which comprises bending a strip of cover material into a ring of larger internal diameter than the external diameter of the roll to be covered, the aid strip being longer in the external periphery of the roll, and, while confining the strip in ring form, forcing it'over the roll while simultaneously placing the ring under compression annularly and axiallythereof, applying cementfor thecontacting surfaces of roll and ring prior to said forcing, and confining the ring on the roll after said forcing until the cement has set.

2. The process of covering a roll which com prises providing a strip of covering material of a lengthsuch that when bent into the form of a ring such ring will have an internal diameter substantially greater than the external diameter of the roll to be covered, bending said strip to iorm said ring, holding aid Strip in said ring form, and forcing said ring onto said roll while simultaneously compressing said ring annularly to decrease its diameter and make its internal diameter coincide with the external diameter of the roll, applying a cement for contacting surfaces of roll and ring, and holding said ring in its compressed form on said roll until the cement has set."

3, the art pi covering a roll with covering material, a method for use with a roll-covering die having an upper portion generally in the form of a truncated cone and a lower portion cylindrical in shape, which method comprises the steps of: placing the roll in the lower portion of the die and substantially aligning the axes thereof; forming a strip of said material into a ring having an internal diameter substantially greater than the external diameter of the roll and an external diameter substantially greater than the internal diameter of the lower portion of said die; applying a cement for the contacting surfaces of the roll and ring; placing said ring in the upper portion of said die; applying pressure to move the ring from the upper to the lower portion of the die whereby to vforce the ring onto said roll while simultaneously applying axial and annular compression to the ring; and holding the ring'in its compressed form 'on said roll until-the cement has set.

EDWARD J .COURTNEY.

vReferences Cited in the file of this patent UNITED ST S PATENTS Number Name Date 647,146 Moreton Apr'. 1 0, 1900 coasts Hudson F- Feb. 11,1902 1,103,772 Hudson -QJju'iy 14,1914 1,205,345 Hatfield Nov/21, 1916 1,303, 14 Swart May 13, 1919 1,706,635 Smith Mar..26, 1929 v 1,9,19,694: Fox July 25, 1933 1,984,525 Baldauf 1;'e'c. 18, 1934 2,091,977 Riddell May'2l, 1935 2,022,170 Yeager f Nov. 26, 1935 2,446,038 Amigo July 27, 1948 

